Watch case spring



(No Model.)

H. R. GAUL. WATCH CASE SPRING.

No. 415,669. Patented Nov 19, 1889.

A, """lllllll I I I 17 1 INVENTOR:

W TN ESSES:

UNITED STATES PATENT OFFICE.

HARRY R. GAUL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE KEYSTONEIVATCII CASE COMPANY, OF SAME PLACE.

WATCHr-CASE SPRING.

SPECIFICATION forming part of Letters Patent No. 415,669, dated November19, 1889.

Application filed May 29, 1889. Serial No. 312,529. (No model.) I I Toall whom it may concern:

Be it known that I, HARRY R. GAUL, of Philadelphia, Philadelphia county,Pennsylvania, have invented an Improvement in WVatch-Oase Springs, ofwhich the following is a specification.

My invention relates to watch-case springs; and it consists of certainimprovements, which are fully set forth in the following specificationand shown in the accompanying drawings, which form a part thereof.

It is the object of my invention to form an effectively operativewatch-case spring in an economical manner, and my invention appliesequally to the lift-spring and to the snap or look spring.

In carrying out my invention I construct a curved spring of sheet metalprovided with the snap or lifting projection at about its center. Thisspring is held within the watchcase by means of flanged projections uponits ends, which engage in notches or cuts formed in the edge of thewatch-case center. In this manner the spring is supported only at itsends, and, being of tempered sheet metal, possesses excellentflexibility at the center or operative portion.

By this invention the screws and similar devices for attaching thesprings to the watchcase center are dispensed with, since the tension ofthe spring forces the flanged ends firmly into the cuts or recesses inthe center, and thereby retains the spring in place, while allowing itto be readily removed, when desired, by the introduction of aninstrument. By inserting the usual dust-band these ends would be firmlylocked in place.

projecting ends D, preferably extending slightly above the upper edge ofthe spring.

E is the push-pin of the watch for operating the snap, extending througha hole 6 in the snap-spring.

F is the liftspring, which is constructed similar to the snap-spring O,and having the lifting projection f. The watch-case center is providedwith notches or cuts a upon its edge adapted to receive the flanged orprojecting ends D of the springs C and F. It is preferable that the arcof the circle describing the distance from one notch a to the othershould be slightly less than the length of the spring, so that when thespring is secured to the watch-case center its central portion, carryingthe snapping or lifting projection, will extend a distance into thegroove of the center, as shown in dotted lines in Fig. 1, to allow playin the groove of the center for the spring in operating, and by thusforcing in the central portion of the spring the pressure upon the endsD is increased, so that they are more firmly held in the notches a. Iprefer also to have the upper edges of the spring taperin g toward thecentral portion, where the snap or lifting projection is located, asshown in Figs. 2 and 3, so that the spring is made narrower and thatthere may be no friction between the upper or lower edge of the springand the watch-case center, whereby the easy operation of the springmight be impeded.

Itis evident that the insertion of the usual dust-rin g or thewatch-movement would look the ends D of the springs in the center in thepositions shown in Figs. 1 and 2.

While I prefer the details of construction here shown, I do not limitmyself thereto, as it is apparent that they may be varied in many wayswithout departing from the spirit of the invention.

WVhat I claim as new, and desire to secure by Letters Patent, is

1. A watch-case spring consisting of a curved piece of thin metalprovided with a projection at about its middle for operating on the lidand having laterally-proj ecting flanges D on its ends formed of agreater width of metal than the body portion of thespring, and therebyextending beyond the edge of said body portion, for the purpose ofattaching the spring Within the watch-case center.

2. The oombinatiomwith a Watch-case center formed with notches upon itsledge, of a case-springhaving its body portion formed of thin springmetal of less depth than the groove of the center, so as to be free tomove therein, and provided on its ends with projections extendinglaterally in the plane of the body of the spring and fitting into thenotches 011 the ledge of the center for the purpose of securing thespring therein.

3. In a watclrcase, a case-spring consisting of a curved piece of thinmetal having a projection at about its middle for operating on the coverand provided on its ends with lateral1y-proj ecting flanges, incombination With the watch-case center formed with radial notches uponits ledge to receive the lateral flanges of the spring for the purposeof securing it within the center.

4. In a watch-case, a case-spring consisting of a curved piece of thinmetal having a projection at about its middle for operating on the coverand provided on its ends with laterally-projecting flanges of greaterWidth of metal than the body portion of the spring, so as to extendabove the upper edge of the body portion, in combination with thewatclrcase center formed with radial notches upon its upper ledge toreceive the upwardly-projecting portions of the lateral flanges of thespring for the purpose of securin g said spring within the center.

In testimony of which invention 1 have hereunto set my hand.

HARRY R. GAUL.

Witnesses:

E. O. CHAPPATTE, H. M. KAIN.

